In one aspect of the invention, a pick comprises a steel body comprising a formed shank attached to a first end of the body and generally extending along a central axis of the body. An impact tip is secured to a second end of the steel body and comprises a carbide substrate attached to the second end of the steel body which is bonded to a superhard material. A composite material is bonded to an outer surface of the steel body and adapted to protect the steel from wear. The composite material comprises a plurality of superhard particles held within a matrix. The matrix comprises a superhard particle concentration of 40 to 80 percent by volume.
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16. A method of depositing a wear resistant composite material onto an outer surface of a steel pick body, comprising:
forming at least one groove in a body of the pick;
providing a composite material by mixing diamond or cubic boron nitride particles with a matrix material, the particles comprising a concentration of 40 to 80 percent by volume;
placing the composite material into the at least one a plurality of annular grooves formed in the outer surface of the body, at least one groove being formed proximate the tip;
heating the composite material to a temperature above the melting temperature of the matrix material and below the melting temperature of the steel; and
cooling the body and the composite material.
1. A pick, comprising:
a steel body comprising a formed shank attached to a first end of the body and generally extending along a central axis of the body;
an impact tip secured to a second end of the steel body;
the tip comprising a carbide substrate attached to the second end of the steel body and being bonded to a diamond material;
a composite material fixed within a plurality of annular grooves formed in an outer surface of the steel body and adapted to protect the steel from wear, at least one groove being formed proximate the tip;
the composite material comprising a plurality of diamond particles held within a matrix; and
the matrix comprising a diamond particle concentration of 40 to 80 percent by volume.
3. The pick of
5. The pick of
6. The pick of
7. The pick of
9. The pick of
10. The pick of
11. The pick of
12. The pick of
13. The pick of
14. The pick of
15. The pick of
17. The method of
18. The method of
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This application is a continuation in-part of U.S. patent application Ser. No. 11/673,634 filed on Feb. 12, 2007 and entitled Thick Pointed Superhard Material. U.S. patent application Ser. No. 11/673,634 is a continuation-in-part of U.S. patent application Ser. No. 11/668,254 which was filed on Jan. 29, 2007 now U.S. Pat. No. 7,353,893 and entitled A Tool with a Large Volume of a Superhard Material. U.S. patent application Ser. No. 11/668,254 is a continuation-in-part of U.S. patent application Ser. No. 11/553,338 which was filed on Oct. 26, 2006 and was entitled Superhard Insert with an Interface. This application is also a continuation-in-part of U.S. patent application Ser. No. 11/424,806 filed on Jun. 16, 2006 and entitled An Attach Tool for Degrading Materials. All of these applications are herein incorporated by reference for all that they contain and are currently pending.
Efficient degradation of materials is important to a variety of industries including the asphalt, mining, construction, drilling, and excavation industries. In the asphalt industry, pavement may be degraded using attack picks, and in the mining industry, attack picks may be used to break minerals and rocks. Attack picks may also be used when excavating large amounts of hard materials. In asphalt recycling, a drum supporting an array of attack picks make up a degradation assembly, which may be rotated and moved so that the attack picks engage a paved surface causing it to break up. Examples of degradation assemblies from the prior art are disclosed in U.S. Pat. No. 6,824,225 to Stiffler, US Pub. No. 20050173966 to Mouthaan, U.S. Pat. No. 6,692,083 to Latham, U.S. Pat. No. 6,786,557 to Montgomery, Jr., US. Pub. No. 20030230926, U.S. Pat. No. 4,932,723 to Mills, US Pub. No. 20020175555 to Merceir, U.S. Pat. No. 6,854,810 to Montgomery, Jr., U.S. Pat. No. 6,851,758 to Beach, which are all herein incorporated by reference for all they contain.
The attack picks typically have a tungsten carbide tip, which usually lasts less than a day in hard milling operations. Consequently, many efforts have been made to extend the life of these picks. Examples of such efforts are disclosed in U.S. Pat. No. 4,944,559 to Sionnet et al., U.S. Pat. No. 5,837,071 to Andersson et al., U.S. Pat. No. 5,417,475 to Graham et al., U.S. Pat. No. 6.051,079 to Andersson et al., and U.S. Pat. No. 4,725,098 to Beach, U.S. Pat. No. 6,733,087 to Hall et al., U.S. Pat. No. 4,923,511 to Krizan et al., U.S. Pat. No. 5,174,374 to Hailey, and U.S. Pat. No. 6,868,848 to Boland et al., all of which are herein incorporated by reference for all that they disclose.
In one aspect of the invention, a pick comprises a steel body comprising a formed shank attached to a first end of the body and generally extending along a central axis of the body. An impact tip is secured to a second end of the steel body and comprises a carbide substrate attached to the second end of the steel body which is bonded to a superhard material. A composite material is bonded to an outer surface of the steel body and adapted to protect the steel from wear. The composite material comprises a plurality of diamond or cubic boron nitride particles held within a matrix. The matrix comprises a diamond or cubic boron nitride particle concentration of 40 to 80 percent by volume.
The particles may be metal bonded. These particles may be bonded by a metal selected from the group consisting of copper, silicon, indium, silver, nickel, manganese, palladium, zinc, cobalt, titanium, tin, gold, and combinations thereof. In some embodiments of the invention the particles may be resin bonded. These particles may be bonded by a resin selected from the group consisting of polyepoxides, plastics, thermosetting resins, polymers, epichlorohydrin, bisphenol A, polyimide, and combinations thereof.
The shank may be secured within a holder attached to a milling drum connected to the underside of a pavement milling machine. The shank may be secured to a trenching machine, or to a bit body adapted for subterranean drilling, horizontal drilling, and/or mining. The shank, carbide substrate and superhard material may be arranged generally coaxial.
The composite material may be secured within at least one groove formed in the outer surface of the steel body. A surface of the composite material may be recessed within the at least one groove, or it may extend beyond the groove. In some embodiments of the invention the composite material may be secured within a pattern of grooves, the pattern may be a conical helix pattern, helical pattern double helical pattern, annular ring pattern, checkered pattern, zigzag pattern, wavy pattern, segmented pattern, circle pattern, or combinations thereof.
The plurality of particles may comprise an average particle size of between 1 and 3500 microns. The outer surface of the steel body may be textured for improving the bond of the composite material to the steel body. The shank may be coated with a hard surface (which may comprise chromium, nickel, carbide, titanium, nitride, silicon, etc.) Some embodiments may comprise a composite material that is bonded to a tapered portion of the steel body.
A method of depositing a wear resistant composite material onto an outer surface of a steel pick body comprises a step of forming at least one groove in a body of the pick. A composite material is provided by mixing diamond or cubic boron nitride particles with a matrix material. The composite material is placed into the at least one groove, and the composite material are heated to a temperature above the melting temperature of the matrix material and below the melting temperature of the steel. After heating the body and composite material are cooled. The method may comprise a further step of press fitting an impact tip into the steel pick body after the body has cooled. The step of heating the composite material may comprise laser heating.
The shank 202 may be coated with a hard surface 210. The hard surface 210 may comprise a cemented metal carbide, chromium, manganese, nickel, titanium, silicon, hard surfacing, diamond, cubic boron nitride, polycrystalline diamond, diamond impregnated carbide, diamond impregnated matrix, silicon bonded diamond, deposited diamond, aluminum oxide, zircon, silicon carbide, whisker reinforced ceramics, nitride, stellite, or combinations thereof. The hard surface 210 may be bonded to the shank 202 through the processes of electroplating, cladding, electroless plating, thermal spraying, annealing, hard facing, applying high pressure, hot dipping, brazing, or combinations thereof. The surface 210 may comprise a thickness of 0.0001 to 0.200 inches. The surface 210 may be polished.
A composite material 208 is bonded to an outer surface 209 of the body 201 and protects the steel from wear. The composite material 208 maybe bonded to a tapered portion, stepped portion, or cylindrical portion of the body 201. The composite material 208 comprises a plurality of diamond, diamond-like and/or cubic boron nitride particles held within a matrix. The matrix comprises 40 to 80 percent diamond or cubic boron nitride particles by volume. It is believed that too low of a particle concentration causes the matrix around the particles to wear away thereby causing more of the particle to be exposed and thereby fall out, which in turn exposes new particles. Preferably there is a high enough concentration of the particles that the particles protect the matrix from wearing away and effectively form a super wear resistant composite material. The particles may comprise an average particle size of between 1 and 3500 microns. More preferably, the average particle size is less than 50 microns. Most preferably, the average particle size is less than 10 microns. It is believed the smaller the particle size the greater wear resistance that the composite material will have and thereby protect the steel from wear.
The matrix material may be a metal or a resin bonded. Metal bonded particles may be bonded by a matrix comprising of silver, copper, silicon, indium, nickel, manganese, palladium, zinc, cobalt, titanium, tin, gold, boron, chromium, germanium, aluminum, iron, gallium, vanadium, phosphorus, molybdenum, platinum, alloys, mixtures and combinations thereof. In some embodiments, the superhard particles may be coated with a metal, such as titanium, niobium, cobalt, tantalum, nickel, iron or combinations thereof, which may adhere better to the particles to the matrix. The particles may be bonded by melting the matrix material to a temperature sufficient to melt the matrix but still below the melting temperature of the steel. A metal bonded matrix may comprise a melting temperature from 700 to 1200 degrees Celsius.
Preferably, the impact tip, which comprises a superhard material bonded to a carbide substrate, is brazed to a carbide bolster which is press fit into a bore formed in the steel body. In other embodiments, the carbide bolster may be brazed to the steel body. In embodiments, where the bolster is brazed to the steel body active cooling during heating of the matrix may be critical, since the heat from brazing may leave some residual stress in the bond between the carbide substrate and the superhard material. In some embodiments, the bolster may be brazed to the steel body at the same time that the composite material is being bonded to the steel body. A heat sink may be placed over at least part of the superhard material 207 or other part of the attack pick during the heating stage. Water or other fluid may be circulated around the heat sink to remove the heat. The heat sink may also be used to apply a force on the pick 101 to hold it together while brazing.
In some embodiments of the invention the composite material 208 may comprise resin bonded particles. These particles may be bonded by a resin selected from the group consisting of polyepoxides, plastics, thermosetting resins, epoxies, polymers, epichlorohydrin, bisphenol A, polyimide, and combinations thereof. The resin may be hardened by adding an activating compound, thereby inducing a chemical reaction, such as a polymerization reaction.
The superhard material 207 may be at least 4,000 HK and in some embodiments it may be 1 to 20000 microns thick. In embodiments, where the superhard material is a ceramic, the material may comprise a region, preferably near its surface, that is free of binder material. Infiltrated diamond is typically made by sintering the superhard material 207 adjacent a cemented metal carbide substrate 302 and allowing a metal (such as cobalt) to infiltrate into the superhard material. In some embodiments the impact tip 205 may be connected to the second end 206 of the body 201 by a carbide bolster 304. In some embodiments the tip 205 and the bolster 304 may be originally formed as a single unit. Typically the impact tip 205 is brazed to the bolster 304 at a planar interface 305.
The superhard material 208 may be bonded to the carbide substrate 302 through a high temperature high pressure process. During high temperature high pressure (HTHP) processing, some of the cobalt may infiltrate into the superhard material such that the substrate 302 comprises a slightly lower cobalt concentration than before the HTHP process. The superhard material 207 may preferably comprise a 1 to 5 percent cobalt concentration by weight after the cobalt or other binder infiltrates the superhard material 207. The superhard material 207 may also comprise a 1 to 5 percent concentration of tantalum by weight. Other binders that may be used with the present invention include iron, cobalt, nickel, silicon, carbonates, hydroxide, hydride, hydrate, phosphorus-oxide, phosphoric acid, carbonate, lanthanide, actinide, phosphate hydrate, hydrogen phosphate, phosphorus carbonate, alkali metals, ruthenium, rhodium, niobium, palladium, chromium, molybdenum, manganese, tantalum or combinations thereof. In some embodiments, the binder is added directly to the superhard material's mixture before the HTHP processing and do not rely on the binder migrating from the substrate into the mixture during the HTHP processing.
The superhard material 207 may comprise a substantially pointed geometry with a sharp apex comprising a radius of 0.050 to 200 inches. In some embodiments, the radius is 0.900 to 0.110 inches. It is believed that the apex may be adapted to distribute impact forces, which may help to prevent the superhard material 207 from chipping or breaking. The superhard material 207 may comprise a thickness of 0.100 to 0.500 inches from the apex to the interface with the substrate 302, preferably from 0.125 to 0.275 inches. The superhard material 207 and the substrate 302 may comprise a total thickness of 0.200 to 0.700 inches from the apex to the base of the substrate. The sharp apex may allow the high impact resistant pick 101 to more easily cleave asphalt, rock, or other formations.
Referring now to
In
Referring now to
Referring now to
The attack pick 101 may be used in various applications. The pick 101 may be disposed in an asphalt milling machine 103, as in the embodiment of
Referring now to
Whereas the present invention has been described in particular relation to the drawings attached hereto, it should be understood that other and further modifications apart from those shown or suggested herein, may be made within the scope and spirit of the present invention.
Hall, David R., Crockett, Ronald, Jepson, Jeff, Fox, Joe
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